US 11,866,048 B2
Limp home mode for a battery electric vehicle
Sören Hansen, Gothenburg (SE); Nicklas Leuchovius, Gothenburg (SE); Sebastian Skoog, Gothenburg (SE); Alma Ciric, Gothenburg (SE); and Adrian Thuresson, Gothenburg (SE)
Assigned to VOLVO CAR CORPORATION, Gothenburg (SE)
Filed by Volvo Car Corporation, Gothenburg (SE)
Filed on Mar. 5, 2021, as Appl. No. 17/193,207.
Prior Publication US 2021/0276556 A1, Sep. 9, 2021
Int. Cl. B60W 30/182 (2020.01); B62D 5/04 (2006.01); B60L 50/60 (2019.01); B60L 58/27 (2019.01); B60L 58/18 (2019.01); B60L 58/12 (2019.01); B60K 35/00 (2006.01); B60L 58/10 (2019.01)
CPC B60W 30/182 (2013.01) [B60K 35/00 (2013.01); B60L 50/60 (2019.02); B60L 58/10 (2019.02); B60L 58/12 (2019.02); B60L 58/18 (2019.02); B60L 58/27 (2019.02); B62D 5/0484 (2013.01); B60K 2370/172 (2019.05)] 20 Claims
OG exemplary drawing
 
1. A safety system for an electric vehicle, wherein the electric vehicle further comprise consumers of electricity, wherein the consumers of electricity are partitioned into a first group of consumers comprising one or more consumers associated with a powering steering system and one or more consumers associated with a propulsion system of the electric vehicle, and a second group of consumers that are different from the first group of consumers, the safety system being configured to be in communication with a battery management system, BMS, of the electric vehicle;
wherein the safety system is adapted for, upon detection of one or more safety related errors in operation of the BMS and/or in operation of a battery system of the electric vehicle, controlling the BMS to switch to:
a) a limp home mode, in case a safety related error in operation of the BMS is detected which is within predetermined safety margins and it is detected that all cells of the battery system operate within their predetermined rated voltage range and predetermined rated temperature range, wherein in the limp home mode, a charging power of the battery system is set to zero, supply of power from the battery system to the first group of consumers is maintained, and supply of power from the battery system to one or more of the consumers of the second group of consumers is disconnected; and
b) a disconnect mode, in case the battery system is detected as operating outside predetermined safety margins or one or more safety related errors in operation of the BMS outside predetermined safety margins are detected, wherein in the disconnect mode, the battery system is completely disconnected from the first group of consumers and the second group of consumers after a predetermined amount of time from said detecting.